The horizontal axis is labeled “Days”, ranging from 0 to 6 in increments of 1 unit. The vertical axis has three categories, from top to bottom: “Calls for accountability,” “Critiques of systemic vulnerabilities,” and “Evolving emotional reactions.” At the top, “Calls for accountability and reform” has 5 rectangular vertically arranged rightward arrows. The first arrow labeled “Identify and prosecute responsible individuals or parties” starts at Day 0 and ends at Day 6. The second arrow labeled “Implement stricter cybersecurity regulations and compliance measures” starts at Day 1 and ends at Day 6. The third arrow, labeled “Disconnect critical systems from the internet to reduce exposure to cyber threats,” starts at Day 1 and ends at Day 6. The fourth arrow labeled “Enhance system monitoring and threat detection mechanisms” starts at Day 2 and ends at Day 6. The fifth arrow, labeled “Increase investment in cybersecurity,” starts at Day 2 and ends at Day 6. On the right, the first two arrows are labeled “Legal and regulatory actions” and the rest three arrows are labeled “Preventive measures.” In the middle, “Critiques of systemic vulnerabilities” has 4 rectangular vertically arranged rightward arrows. The first arrow, labeled “Outdated technology used in many critical infrastructure systems,” starts at Day 1 and ends at Day 6. The second arrow labeled “Lack of qualified personnel” starts at Day 1 and ends at Day 6. The third arrow labeled “Connect critical infrastructure systems to the internet” starts at Day 2 and ends at Day 6. The fourth arrow labeled “Increasing cyber threats” starts at Day 3 and ends at Day 6. On the right, the first three arrows are labeled “Technical vulnerabilities” and the rest three arrows are labeled “Preventive measures.” At the bottom, “Evolving emotional reactions” has 3 rectangular, vertically arranged rightward arrows. The first arrow labeled “Humor and sarcasm” starts at Day 0 and ends at Day 3. The second arrow, labeled “Fear and sense of urgency,” starts at Day 2 and ends at Day 5. The third arrow, labeled “Collective anxiety,” starts at Day 4 and ends at Day 6.Timeline-based categorization of Twitter responses. Source: Authors’ own work